Quote:
Originally Posted by theredhouseinn
Meanwhile, yesterday, I went through the IF alignment proceedure. It was a long way out, but tuned up ok, giving me a 20dB increase in gain. 20 micro volts into the grid of the mixer gave me an audible signal at the detector. This leads me to think that the 680pf's may be failing in the cans.
John.
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It is heartwarming to read remarks like this, in that clearly before you tried re-alignment you made a gain measurement. One major error that often gets made in receiver alignment protocols is that the performance is not documented first before the alignment is altered. So in the end the person doing it has no idea if they have improved the performance, not changed it, of perhaps made it worse than it was. So Well done !
One clue if its the capacitors in the cans, is that each stage should have a similar sharp peak, of one has become broad its a little suspicious.